<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>地图</title>
    <style>
        body {
            background-color: #333;
        }
        .map {
            position: relative;
            width: 747px;
            height: 617px;
            background: url(../images/png/map.png);
            margin: 0 auto;
        }
        @keyframes amplify {
            0% {
                width: 4px;
                height: 4px;
            }
            70% {
                width: 30px;
                height: 30px;
                /* 透明度 */
                opacity: 1;
            }
            100% {
                width: 45px;
                height: 45px;
                /* 透明度 */
                opacity: 0;
            }
        }
        .city {
            position: absolute;
            top: 238px;
            left: 556px;
            
        }
        .city .dotted {
            box-shadow: 0 0 12px lightskyblue;
            border-radius: 50%;
            background-color: blue;
        }
        .city div[class^="pulse"] {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            box-shadow: 0 0 12px lightskyblue;
            border-radius: 50%;
            /* animation: name duration timing-function delay iteration-count direction fill-mode; */
            animation: amplify 1s linear infinite;
        }
        .city div.pulse2 {
            animation-delay: 0.4s;
        }
        .city div.pulse3 {
            animation-delay: 0.8s;
        }

    </style>
</head>
<body>
    <div class="map">
        <div class="city">
            <div class="dotted"></div>
            <div class="pulse1"></div>
            <div class="pulse2"></div>
            <div class="pulse3"></div>
        </div>
    </div>
</body>
</html>